require 'digest/sha1'
class User < ActiveRecord::Base
  acts_as_paranoid
  # Virtual attribute for the unencrypted password
  attr_accessor :password

  belongs_to :user_rank

  validates_presence_of     :login
  validates_presence_of     :email
  validates_presence_of     :points
  validates_presence_of     :coin
  validates_presence_of     :money
#  validates_presence_of     :password,                   :if => :password_required?
#  validates_presence_of     :password_confirmation,      :if => :password_required?
#  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :login,    :within => 3..40
  validates_length_of       :email,    :within => 3..100
  validates_uniqueness_of   :login, :email, :case_sensitive => false
  before_save :encrypt_password

  HUMANIZED_ATTRIBUTES_ORDERS = {:login => 1,
                                 :email => 2,
                                 :points => 3
  }

  USER_RANK = ["", "普通会员", "高级会员", "VIP会员"]
  OPTIONS_FOR_SELECT = [["普通会员", 1], ["高级会员", 2] , ["VIP会员", 3]]

  def validate
    pp self.errors
  end

  # 导入默认用户
  #【参数】
  #【返回值】
  #【注意】
  #【作者】by ljl 2012.02.03
  def self.import_data
    user = User.new({:login => "winseed",
                     :password => "123456",
                     :password_confirmation => "123456",
                     :email => "gauseed@qq.com",
                     :email_check => true,
                     :points => 1000,
                     :coin => 1000,
                     :reg_time => Time.now
                    })
    user.save(false)
  end

  def show_email_check
    self.email_check ? "<img src='/images/admin/yes.gif' />" : "<img src='/images/admin/no.gif' />"
  end
  
  def show_user_rank
#    return USER_RANK[self.rank_id]
  end
  
  def show_reg_time
    self.reg_time ? self.reg_time.strftime("%Y-%m-%d") : "--"
  end
  
  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find_by_login(login) # need to get the salt
    u && u.authenticated?(password) ? u : nil
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at 
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    self.remember_token_expires_at = 2.weeks.from_now.utc
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  protected
    # before filter 
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
      self.crypted_password = encrypt(password)
    end
    
    def password_required?
      crypted_password.blank? || !password.blank?
    end
end
